Valve mechanism for internal-combustion engines



' 1,618,045 15 1927' w. H. BAHAN ET AL VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed June 192,5

liamu I g I moemtou iv. H 3mm. 5. H B7Z'er Patented Feb. 15, 1927.

- UNITE o stares WILLIAM H. BAHAN A1\TD1BERRY"H. BOYTEB, or G EENVILLE, son'rn CARO INA] ALVE n onAnIsMron rnrnnnnn-oorannsrron enemas.

Application filed-Janet,

This invention relates to an improved valve mechanism for lnternal combustion engines and while being well adapted for The, invention seeks, as a further object, to

provide each valve with an adjustable foot to coact with the valve tappet, wherein the foot will be. formed of hardened metal so that wear will be reduced 'to a minimum,

and wherein locking means willzbe provided 7 for the foot.

And the invention seeks, as a stillfurther object, to provide'a mechanism wherein the lockin means for the valve foot will also providla a supporting. abutment for the lower seat of the valve spring so that when any adjustment is made in the position of the foot and the locking means therefor, a corresponding adjustment will be made in the tension on the valve spring.

Other objects of the invention not specifically mentioned in the foregoing, will appear during the course of the following description.

In the accompanying drawings: a I Figure 1 is a vertical sectional view showing our improved mechanism in connection with a Ford engine.

Figure 2 is anenlarged detail sectional view particularly showing the mounting of the foot of the valve. i

As is well known, the Ford engine, as at present delivered from the factory, embodies no means whereby the clearance between the valve tappets and the valve stems maybe I adjusted or varied and, accordingly, after the parts become worn, which soon occurs, it is necessary, in order to eliminate the noise resulting from the excess clearance between the valve 'tappets and the valve stems, to either elongate the valve stems by hammering thereon or else. install entirely new va ves.

The former procedure is very in accurate while the latter procedure necessarily entails considerable expense. The present invention, therefore, seeks to overcomethese difliculties. In the drawings, aportion of one of the'cylindersof a Ford engine is indicated at 10, the cam shaft at 11, one of the cams at 12, and the cooperating 1926. Serial No. 114,331.,

tappet at 13. The associated valveseat. of

the engine is indicated at, 14: and the axially 7 alined valve'guide' at 15.

In accordance with the present improve-i ments, the usual valves of.the engine are supplanted by the valves 0f thepresent in vention and in the following description we shall describe one of the valves and as-;

sociated parts in detail as typical of all.

- The valve is indicatedat 16. This valve is formed to coactwith the seat l t-and is provided witha stem17 which is 'freelyslidable through the guide 15. As particularly seen 'in Figure 2, the stem jis threaded at its lower end, and screwed thereon is, a'pref-;

erably case hardened foot 18 having an axialthreaded socket 19; to accommodate the lower terminal f the; stem. Atits lower thereof, is a lock nut 22, and freely surrounding the stem to seat fiat against said nut is the" usual lower valve spring seat 23.

,The lower end of the customary valve spring 24; rests in this seat, and freely surrounding the Valve stem to abut the valve guide 15 is the usual upper spring seat 25 for said spring. Formed in the valve stem 17 near the lower GDCllllGIGOf is an opening 26 which, as shown in Figure2, is adapted to removably receive a suitable pin, as indicated at 27. r

As will now be seen, the foot 18 may be adjusted on the lower end of thevalve stem 17 until the desired clearance between said foot and the tappet 13 is obtained when,by

adjusting the nut 22 into binding engagement with the foot, the foot may be locked in adjusted position. Thus, wear on the foot or on the tappet maybe readily taken up;

However, since thefoot is formed of-case hardened material, very little wear on the foot will occur and, accordingly, frequent adjustment ofthe foot will be found unnecessary. The opening 26 in the valve stem nicety while, also, the nut 22 may be adjusted into firm binding engagement with the foot. As willbe observed, the nut 22 provides a supporting abutment for the lower spring seat 23 and, accordingly, as the foot '18 is adjusted on thevalve stem and the nut is adjusted into engagement'with the foot,

' a correspondingadjustment will be made in the tension of'the valve spring so that by maintaining the clearance between the tappet and the foot substantially constant, the travel of the valve will be maintained correspondingly constant, with the result that the strain on the spring, when flexed by the opening of the valve, will also be maintained substantially constant. Furthermore, since the same clearance will be maintained between allof the tappets of theengine and all of the valves, the Working stress: on the valve springs, when'the engine is in opera tion, will be substantiallyuniform. Pre

ing a stem slidable through said guide, and

combustion engine, a 1

a foot carried by the valve, stem to coact with the tappet and adjustable on thestexn for varying the clearance between the foot and tappet, the valve stem-being provided with an'opening to removably receive a device manually engageableifor holding the valve stem against rotation while the foot is being adjusted. v p

2. In an internal combustion engine, a tappet, a cam shaft having-a cam to c'oact with the tappet, a valve guide, a valve having astem slidable through said gu1de,- a foot I,

screwed over the lower endgof; the valve stem to coact with the tappet and having a threaded socket accommodating the lower terminal of the stem, the foot beingadjustable on thestem for varying the clearance between the foot andtappet, a nut adj ustably mounted" on the stem to abut said foot for locking the foot in adjustedposition, a spring normally holding the valve closed and a seat spring freely carried by the ,valve'stemand mounted upon the nut and adjustable upon the stem upon. adjustment of the nut.-

In testimony whereof we aflix oursignatures. v

. 'WILLIAMH. BAHA BERRY H. BorTER. 

